Reconstructing the ideal results of a perturbed analog quantum simulator

Abstract

Well-controlled quantum systems can potentially be used as quantum simulators. However, a quantum simulator is inevitably perturbed by coupling to additional degrees of freedom. This constitutes a major roadblock to useful quantum simulations. So far there are only limited means to understand the effect of perturbation on the results of quantum simulation. Here, we present a method which, in certain circumstances, allows for the reconstruction of the ideal result from measurements on a perturbed quantum simulator. We consider extracting the value of the correlator $⟨{\hat{O}}^i(t){\hat{O}}^j(0)⟩$ from the simulated system, where ${\hat{O}}^i$ are the operators which couple the system to its environment. The ideal correlator can be straightforwardly reconstructed by using statistical knowledge of the environment, if any $n$-time correlator of operators ${\hat{O}}^i$ of the ideal system can be written as products of two-time correlators. We give an approach to verify the validity of this assumption experimentally by additional measurements on the perturbed quantum simulator. The proposed method can allow for reliable quantum simulations with systems subjected to environmental noise without adding an overhead to the quantum system.

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Cited by in corpus (5)

• Mitigating depolarizing noise on quantum computers with noise-estimation circuits
• Finding the ground state of the Hubbard model by variational methods on a quantum computer with gate errors
• Effects of gate errors in digital quantum simulations of fermionic systems
• KAM-Stability for Conserved Quantities in Finite-Dimensional Quantum Systems
• Robustness of quantum symmetries against perturbations